Finding the Fourth Proportional to 78,456.57, 108,287.42 and 51,601.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,456.57 : 108,287.42 = 51,601.65 : x
2. Step 2: Convert to fraction form
   78,456.57/108,287.42 = 51,601.65/x
3. Step 3: Cross multiply
   78,456.57x = 108,287.42 × 51,601.65
4. Step 4: Simplify right side
   78,456.57x = 5,587,809,288.23
5. Step 5: Solve for x
   x = 5,587,809,288.23/78,456.57
6. Step 6: Final answer
   x = 71,221.69